Heating system



June l, 1943- c. G. MUNTERS ET AL HEATING SYSTEM Filed May 9, 1940 EEZE;E:

M www a; mm* Y u Z mv BYW/ Patented June 1, 1943 HEATING SYSTEIVI CarlGeorg Munters and Martin Hedmark, Stockholm, Swedenl Application May 9,1940', Serial No. 334,158 In Sweden July 17, 1937 8 Claims.

The present application is a continuation in part of our copendingapplication Serial No. 217,698, filed July 6, 1938.

Our invention relates to heating systems for buildings, and moreparticularly to an improved flue or chimney forming part of such heatingsystems.

Heretofore it has been the practice to construct the flue or chimney ofmassive masonry. The thick walls of the chimney were necessary in orderto provide sufiicient heat insulation and the chimney necessarily had alarge heat accumulating capacity, and the heat absorbed was lost to agreat extent.

In accordance with our invention the flue is constructed of metallicpipe sections, which extend through the iloors of the house and whichare surrounded by a water jacket in the form of a shell welded orotherwise suitably secured to the section or conduit forming the flue.Said jacket forms part of a circulation system for water. One or morepermanently open conduits interconnect two points of the water jacket atdifferent levels and form a return flow conduit of said circulationsystem. Radiators for room heating are preferably connected to thesystem and adapted at will to be by-passed by or form part of saidconduit or conduits. A hot water heater is in heat exchange relationwith said circulation system.

A further advantage of our invention is that the ilu@ may be installedafter the building has been erected.

Another object of our invention is to provide in combination with aheating system of the above described type, an improved arrangement forheating hot water for domestic purposes.

Further objects and advantages of our invention will be apparent fromthe following description considered in connection with the accom-.panying drawing which forms a part of this specification and of which:

The single figure is a cross-sectional View of a preferred embodiment ofour invention.

In the drawing there is shown a preferred embodiment of our inventioninstalled in a house having one story and an attic above the cellar.Reference character |l designates generally the house, having a cellar afirst story I2 and an attic I4 covered by a roof I5. A furnace 'I0 islocated in the cellar and includes a fuel compartment 'I i. The furnaceis provided with 'water jackets T2. At the upper part of the furnace theflue gases escape through a collar 'i3 which carries a rst Ilue sectiondesignated generally by reference character 74.

Section 'Hl includes an inner conduit 't5 and an outer jacket l. Thelower end of the conduit i6 is bent inwardly, as is shown at 'il and issecured to jacketV 'I5Y in a fluid-tight manner. The upper end of themembers l5; 'I6 are rigidly interconnected in fluid-tight manner. Aconduit i8 connects the upper part of the furnace jacket 12 with thelower end of the water jacket formed in the flue section 74. A layer ofinsulating material 'I9 surrounds jacket '16.

Reference character lll)v designates generally a second flue section.This section includes an inner conduit 6| for conveying products ofcombustion and an outer jacket 82. The upper end of jacket 82constitutes a container 83, which concentrically surrounds part ofconduit 8|. The upper end of conduit 8| passes through and is rigidlyconnected to the upper wall |22 of container 83. The lower wall |23 ofcontainer 83 is rigidly connected to a tubular member 813 whichconstitutes the lower part of jacket 82. The lower endsA of conduit 8I-andV tubular member 84 are secured together in fluid tight relationship.The flue sections 14 and 8U are secured to one another by a band 85. Theupper part of jacket 'l5 is connected to the upper part of container 83by means of a conduit lil which extends through the lower Wal-l |23 andthence upwardly within the container. A water supply pipe 81 extendsthrough the side Wall of the container 83- and is connected to the lowerend of a double pipe coil 88 which is disposed within the container 83.A conduit 2%9 is connected to the upper end of coil 88 and extendsthrough the side Wall of container 83 and may be connected to conduitsleading to taps located at various points in the house.

A conduit 90 is connected to the lower end of the container 83 andextends into the cellar where it is connected through a valve 9| to aconduit 92 leading to one or more hot Water radiators 93. A valve 94 maybe located in the conduit 92 adjacent to the radiator in order toregulate the heat output of the radiator. A return conduit 95 leads fromthe bottom of the radiator to the lower part of the water jacket l2 ofthe furnace. A by-pass conduit 96 connects conduit B with conduit 95adjacent to the lower part of the Water jacket 12, while a by-passconduit 91 connects conduit S5 with conduit 92. An overflow line 98extends from the upper part of container 83 through the roof l5 of thehouse, a tank 99 being interposed in this line.

A flue section |00 is connected to the upper end of section 80 andextends through the roof,

Section includes an inner conduit |0| and an outer conduit |02, anannular space |03 being formed therebetween. This may constitute a deadair space or it may be lled With heat insulating material. Insulatingmaterial 203 in block form may be placed over the upper end of section80 and around the lower end of section |00.

A thermostatic element |04 is located in heat exchange relationship withthe upper end of jacket 82 and is connected to a Bourdon tube |07. Theend of this tube is connected by means of a chain |08 with a damper |09which regulates the supply of air to the furnace 10.

The house is preferably provided with Walls ||0 enclosing a space withinwhich extend the lue sections 14 and 80. A plate separates said spacefrom the cellar. A conduit I i3 is provided with an air inlet opening H4at the exterior of the building l0. This conduit leads to the lower partof a space |I2 around the container 83. The upper part of the spacecommunicates through a passage With the upper part of the first story|2. This passage is provided with louvers H8. Air admitted through theconduit H3 is heated in the space ||2 and discharged into the room.

The above described device operates as lows:

The fuel burning within furnace 10 heats the water contained Within theWater jacket 12, while the products of combustion pass upwardly throughconduits '15, 8| and |0l. During their passage through conduits 'i5 and8| the gases heat the water contained in jackets It and 82, which latterjacket includes container 83. The water heated in jacket 12 around thefurnace flows through conduit 18 to jacket 15 and the water flows fromthe upper end of this jacket through the conduit Hl into the upper partof container 83. If water is drawn from any of the taps connected toconduit 89, cold Water is introduced into the coil 88 through theconduit 87. In passing through the coil 88 this water is heated, thuscooling the Water contained in container 83. The water thus cooled flowsdownwardly through container 83 and through conduit 90. If valve 9| isclosed, this water cws through by-pass 98 to conduit 95 and back to thelower part of the furnace water jacket T2. Thus, a continuous thermalcirculation of water takes place through the system. It will be notedthat the flow of water through coil 88 is countercurrent to the flowthrough container 83.

If valve 9| is open, the water returning from jacket space 83 flowsthrough this valve and through conduit 92 to the radiator 93 where it iscooled and gives up heat to the room. The Water thus cooled in theradiator falls through the pipe 95 and is returned to the Water jacket12 of the furnace. The temperature at which the water within thecontainer 83 is maintained is apt to be higher than is desirable for thetemperature of the water supplied to the radiator 93. Consequently theby-pass 91 is provided whereby, if valve 9| is partially closed, acertain percentage of the Water returning from the radiator 93 isrecirculated and mixed with the water supply through the conduit 90 fromthe container 83.

The thermostatic element |04 contains a fluid, such as mercury, whichexpands upon an increase in temperature. This causes the Bourdon tube|01 to straighten out, thus acting through folthe chain |08 to close thedamper |09 to thereby 75 reduce the amount of air admitted to thefurnace. In this manner the temperature of the water within thecirculating system is prevented from rising to an undesirably highvalue.

While we have shown and described a more or less specific embodiment ofour invention, it is to be understood that this has been done forpurposes of illustration only and is not to be considered as limitingthe scope of the invention, which is to be determined by the appendedclaims.

What we claim is:

l. In a heating system, a furnace, a nue providing a path of ow for hotgas from said furnace, said flue including a plurality of hollow membersjoined together for flow therethrough of gas, an individual liquidjacket surrounding each of said members and said furnace, a conduitconnecting adjacent jackets for iiow therebetween of liquid, a heatingcoil disposed in the uppermost of said jackets, the conduit whichconnects the uppermost jacket With the jacket next below communicatingwith said uppermost jacket at the upper end thereof, and a conduitconnecting the lower part of said uppermost jacket with the jacketsurrounding said furnace.

2. In a heating system, a furnace, a flue providing a path of flow forhot gas from said furnace, said iiue including a plurality of hollowmembers joined together for flow therethrough of gas, an individualliquid jacket surrounding each of said members and said furnace, aconduit connecting adjacent jackets for flow therebetween of liquid, theconduit which connects the uppermost of said jackets with the jacketnext below communicating withsaid uppermost jacket adjacent to the upperend thereof, a heating coil disposed in said uppermost jacket, means forintroducing water to be heated into the lower end of said coil, means towithdraw heated water from the upper end of said coil, and a conduitconnecting the lower part of said uppermost jacket with the jacketsurrounding said furnace.

3. In a heating system, a furnace, a ue providing a path of iiow for hotgas from said furnace, said iiue including a plurality of hollow membersjoined together for flow therethrough of gas, an individual liquidjacket surrounding each of said members and said furnace, a conduitconnecting adjacent jackets for iiow therebetween of liquid, the conduitwhich connects the uppermost of said jackets with the jacket next belowcommunicating with said uppermost jacket adjacent to the upper endthereof, a hot water radiator, a conduit connecting the lower part ofsaid uppermost jacket with said radiator, a conduit connecting saidradiator with the jacket surrounding said furnace, a valve in thelastrnentioned conduit, and a by-pass around said Valve and saidradiator connecting said conduits together.

4. In a heating system, a furnace, a flue providing a path of flow forhot gas from said furnace, said flue including a plurality of hollowmembers joined together for flow therethrough of gas, an individualliquid jacket surrounding each of said `members and said furnace, aconduit connecting adjacent jackets for flow therebetween of liquid, theconduit which connects the uppermost of said jackets with the jacketnext below communicating with said uppermost jacket adjacent to theupper end thereof, a hot water radiator, a conduit connecting the lowerpart of said uppermost Jacket with said radiatorl a conduit connectingsaid radiator with the jacket surrounding said furnace, and a by-passconnecting said conduits whereby a portion of the water leaving saidradiator is recirculated therethrough.

5. In a heating system for buildings having a plurality of floors, afurnace, a flue providing a path of flow for hot gas from said furnace,said flue including a hollow member for flow therethrough of gas, liquidjacket means surrounding said member and said furnace, said jacket meansextending upwardly through said oors and forming part of a circulationsystem for liquid, a permanently open conduit interconnecting two pointsof the liquid space of said jacket means at different levels and forminga return flow conduit of said circulation system, a radiator for roomheating connected to said conduit, means for by-passing fluid aroundsaid radiator, and a hot water heater in heat exchange relation withsaid jacket means.

6. In a heating system, a furnace, a iiue providing a path of ilow forhot lue gases from said furnace, a liquid jacket surrounding at least aportion of said flue, conduit means connected at diierent levels to saidjacket to provide a liquid circulation system, said conduit meansincluding an inlet connected to the upper part of said jacket and anoutlet connected to the lower part of the jacket, a water heater in heatexchange relation with the upper part of said jacket, and means forsupplying relatively cold water to said heater to thereby produce adownwardly directed flow of liquid in said jacket in a directioncounter-current to the flow of said ue gases.

'7. In a heating system, a furnace, means forming a flue for products ofcombustion from said furnace, vertically disposed upper, intermediateand lower liquid jackets surrounding said flue, the upper part of thelower jacket being connected with the lower part of the intermediatejacket, the upper part of the intermediate jacket being connected withthe upper part of the upper jacket, the lower part of the upper jacketbeing connected with the lower part of the lower jacket, and a waterheater in heat exchange relation with the upper jacket.

8. In a heating system, a furnace, a flue providing a path of ilow forhot flue gases from said furnace, a liquid jacket surrounding at least aportion of said flue, a radiator, a conduit connected to an upperportion of said jacket and to said radiator, said conduit having anintermediate portion located below said radiator, a return conduitconnected to said radiator and to a lower portion of said jacket, and aby-pass conduit connected between the low intermediate portion of thefirst-mentioned conduit and said return conduit,

CARL GEORG MUNTERS. MARTIN HEDMARK.

